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- Log -
commit 8e626db7182e01ad09bdab91f6a83ecb2dbde4e3
Author: Jonathan Wakely 
Date:   Mon Apr 22 11:03:07 2024 +0100

Improve grammar for AVR changes in GCC 14

diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index 4a9670fd..8dfbf7dc 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -782,13 +782,13 @@ a work-in-progress.
 AVR
 
   On AVR64* and AVR128* devices, read-only data is now located in program
-memory per default and no more in RAM.
+memory per default and no longer in RAM.
 
   Only a 32 KiB block of program memory can be used to store
and access .rodata in that way. Which block is used can be selected
-   by defining symbol __flmap.
+   by defining the symbol __flmap.
As an alternative, the byte address of the block can be specified
-   by symbol __RODATA_FLASH_START__ which takes
+   by the symbol __RODATA_FLASH_START__ which takes
precedence over __flmap.
For example, linking with
-Wl,--defsym,__RODATA_FLASH_START__=32k
@@ -801,9 +801,9 @@ a work-in-progress.
href="https://github.com/avrdudes/avr-libc/issues/931";>#931
can be used. The latter initializes NVMCTRL_CTRLB.FLMAP
in the startup code and according to the value
-   of __flmap resp.
+   of __flmap or
__RODATA_FLASH_START__.
-  When AVR-LibC with #931 is used, then defining symbol
+  When AVR-LibC with #931 is used, then defining the symbol
__flmap_lock to a non-zero value will set bit
NVMCTRL_CTRLB.FLMAPLOCK. This will protect
NVMCTRL_CTRLB.FLMAP from any further changes —
@@ -812,7 +812,7 @@ a work-in-progress.
can be used:
 __asm (".global __flmap_lock"  "\n\t"
"__flmap_lock = 1");
-  When you do not want the code from #931, then define global
+  When you do not want the code from #931, then define a global
symbol __do_flmap_init and the linker will not pull in
that code from libmcu.a any more.
   In order to return to the old placement of read-only data in RAM,
@@ -822,7 +822,7 @@ __asm (".global __flmap_lock"  "\n\t"
  functionality.
   
   Read-only data is located in output section .rodata,
-   wheras it is part of .text when located in RAM.
+   whereas it is part of .text when located in RAM.
   The feature is only available when the compiler is configured
with a version of Binutils that implements
https://sourceware.org/PR31124";>PR31124, which is the
@@ -870,7 +870,7 @@ __asm (".global __flmap_lock"  "\n\t"
   
 On the Reduced Tiny devices,
 the meaning of register constraint "w" has been changed.
-It containts now the registers R24…R31 like it is the case for all
+It now constrains the registers R24…R31 as is the case for all
 the other devices.
   
 

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 1 file changed, 8 insertions(+), 8 deletions(-)


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commit ced576434ed310d0afee01d88d0c56f78b4d04c5
Author: Jonathan Wakely 
Date:   Fri May 3 16:04:49 2024 +0100

Add caveat to GCC 14 release notes about C warnings-as-errors change

diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index 46a0266d..82906de1 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -40,6 +40,11 @@ a work-in-progress.
   https://gcc.gnu.org/onlinedocs/gcc/Warning-Options.html#index-Wflex-array-member-not-at-end";>-Wflex-array-member-not-at-end
 to
   identify all such cases in the source code and modify them.
   
+  C:
+  Certain warnings about are now errors, see
+  Porting to GCC 14
+  for details.
+  
   https://gcc.gnu.org/onlinedocs/gcc/Instrumentation-Options.html";>-fcf-protection=[full|branch|return|none|check]
   is refactored, to override -fcf-protection,
   -fcf-protection=none needs to be added and then

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commit 8ee66061ef0ec3fb5593dc42cf04aaee1c5d5e1e
Author: Ben Boeckel 
Date:   Tue May 7 11:01:17 2024 +0100

gcc-14: document P1689R5 scanning output support

diff --git a/htdocs/gcc-14/changes.html b/htdocs/gcc-14/changes.html
index 2a4b2f12..ca5174de 100644
--- a/htdocs/gcc-14/changes.html
+++ b/htdocs/gcc-14/changes.html
@@ -515,6 +515,13 @@ You may also want to check out our
   GCC supports a new pragma #pragma GCC novector to
   indicate to the vectorizer not to vectorize the loop annotated with the
   pragma.
+  C++ module scanning for named modules is now available, based on the
+format described in https://wg21.link/P1689R5";>P1689R5,
+Format for describing dependencies of source files.
+The -fdeps-format=, -fdeps-file=, and
+-fdeps-target= flags may be used to generate dependency
+information. In GCC 14 p1689r5 is the only valid argument
+for -fdeps-format=.
 
 
 Runtime Library (libstdc++)

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- Log -
commit 56edd34fc291a0b46a4eb15e0aa835953b1eab6c
Author: Jonathan Wakely 
Date:   Wed Aug 28 15:14:22 2024 +0100

Document libstdc++ changes in GCC 15

diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index d0d6d147..91c020dd 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -84,7 +84,24 @@ a work-in-progress.
 when parsing a template.
   
 
-
+Runtime Library (libstdc++)
+
+
+  Improved experimental support for C++26, including:
+
+views::concat.
+Member visit.
+Type-checking std::format args.
+
+  
+  Improved experimental support for C++23, including:
+
+
+  Clarify handling of encodings in localized formatting of chrono types.
+
+
+  
+
 
 
 

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 1 file changed, 18 insertions(+), 1 deletion(-)


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- Log -
commit dcd642bf2074f34ae43ea7123eaf6743a6057abd
Author: Jonathan Wakely 
Date:   Wed Oct 9 14:00:11 2024 +0100

Document defining _GLIBCXX_ASSERTIONS for -O0

diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index ad0daf04..805a6703 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -93,6 +93,9 @@ a work-in-progress.
 Runtime Library (libstdc++)
 
 
+  Debug assertions are now enabled by default for unoptimized builds.
+Use -D_GLIBCXX_NO_ASSERTIONS to override this.
+  
   Improved experimental support for C++26, including:
 
 views::concat.

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 htdocs/gcc-15/changes.html | 3 +++
 1 file changed, 3 insertions(+)


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- Log -
commit 17c61dd6dc25634cbb7e41747fcf15d78f44c89d
Author: Jonathan Wakely 
Date:   Wed Feb 5 14:47:39 2025 +

Add some libstdc++ additions to GCC 15 release notes

diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index 18484915..02f8752f 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -370,6 +370,13 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
   
   Improved experimental support for C++23, including:
 
+
+  std and std.compat modules
+  (also supported for C++20).
+
+
+  std::flat_map and std::flat_set.
+
 
   Clarify handling of encodings in localized formatting of chrono types.
 

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 htdocs/gcc-15/changes.html | 7 +++
 1 file changed, 7 insertions(+)


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- Log -
commit e70082a2a05cfc1d1c2944a066e89de59374d46c
Author: Jonathan Wakely 
Date:   Thu Jan 16 10:47:53 2025 +

Document dependency changes for libstdc++  header

diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index 2bc0d4e5..b9b2efc7 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -153,6 +153,9 @@ may need to be included explicitly when compiling with GCC 
15:
   and 
   (for std::int8_t, std::int32_t etc.)
 
+ 
+(for std::endl, std::flush etc.)
+
 
 
 Deprecated headers

commit 3062b292084326264d51833ba7a997718e6ffdc4
Author: Jonathan Wakely 
Date:   Thu Jan 16 10:42:00 2025 +

Document libstdc++ headers that are deprecated in GCC 15

diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index c446e309..2bc0d4e5 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -155,6 +155,17 @@ may need to be included explicitly when compiling with GCC 
15:
 
 
 
+Deprecated headers
+
+Some C++ Standard Library headers now produce deprecation warnings when
+included. The warnings suggest how to adjust the code to avoid the warning,
+for example all uses of  and
+ can simply be removed,
+because they serve no purpose and are unnecessary in C++ programs.
+Most uses of  can be adjusted to use
+ instead, and uses of 
+can use  and/or .
+
 
 
 

---

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 htdocs/gcc-15/porting_to.html | 14 ++
 1 file changed, 14 insertions(+)


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- Log -
commit 9a77c1a1eb9c35f015e40f7ed2871f967f87e111
Author: Jonathan Wakely 
Date:   Wed Oct 9 18:42:29 2024 +0100

Document that gcc-8 changed the default to -std=gnu17

diff --git a/htdocs/gcc-8/changes.html b/htdocs/gcc-8/changes.html
index c329a509..12db068a 100644
--- a/htdocs/gcc-8/changes.html
+++ b/htdocs/gcc-8/changes.html
@@ -24,6 +24,8 @@ You may also want to check out our
 
 Caveats
 
+  The default mode for C is now -std=gnu17 instead of
+-std=gnu11.
   Support for the obsolete SDB/coff debug info format has been
   removed.  The option -gcoff no longer
   does anything.
@@ -536,6 +538,14 @@ $ gcc unclosed-2.c
 
 
 
+C
+  
+New options -std=c17, to select support for the 2018
+edition of the ISO C standard (__STDC_VERSION__ == 201710L),
+and -std=gnu17, for C17 with GNU extensions.
+The default mode has been changed to -std=gnu17.
+  
+
 C++
 
   GCC 8 (-fabi-version=12) has a couple of corrections to the 
calling

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- Log -
commit 5f0d63fa2a1c45b1d7849dafca4e2a7dfcd1f0e4
Author: Jonathan Wakely 
Date:   Fri Apr 4 10:11:06 2025 +0100

Document some more libstdc++ additions in gcc-15

diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index 3cec4ff4..3e3c6655 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -564,9 +564,24 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
   Debug assertions are now enabled by default for unoptimized builds.
 Use -D_GLIBCXX_NO_ASSERTIONS to override this.
   
+  
+Associative containers and lists now use custom pointer
+types internally, instead of only when interacting with their allocator.
+  
   Improved experimental support for C++26, including:
 
-views::concat.
+views::concat, views::to_input,
+  views::cache_latest.
+
+
+  Sorting algorithms and raw memory algorithms are constexpr
+  so can be used during constant evaluation.
+
+
+   and 
+  headers.
+
+std::is_virtual_base_of type trait.
 Member visit.
 Type-checking std::format args.
 
@@ -580,6 +595,14 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
 
   std::flat_map and std::flat_set.
 
+
+  std::from_range_t constructors added to all containers,
+  as well as new member functions such as insert_range.
+
+
+  Formatting of ranges and tuples with std::format,
+  as well as string escaping for debug formats.
+
 
   Clarify handling of encodings in localized formatting of chrono types.
 

---

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 htdocs/gcc-15/changes.html | 25 -
 1 file changed, 24 insertions(+), 1 deletion(-)


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- Log -
commit bcc6e4bf6f0747bb264f0d1119655233046007e8
Author: Jonathan Wakely 
Date:   Fri Apr 25 11:10:47 2025 +0100

Update documentation URL in robots.txt

diff --git a/htdocs/robots.txt b/htdocs/robots.txt
index 01ae43dd..526fa1dd 100644
--- a/htdocs/robots.txt
+++ b/htdocs/robots.txt
@@ -1,4 +1,4 @@
-# See http://www.robotstxt.org/wc/robots.html
+# See https://www.robotstxt.org/robotstxt.html
 # for information about the file format.
 # Contact g...@gcc.gnu.org for questions.
 

---

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 htdocs/robots.txt | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)


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commit c9590a1671e50c297bf3042e0d0b8345bec4f4a7
Author: Jonathan Wakely 
Date:   Wed May 14 21:28:04 2025 +0100

Remove claims that the release timeline shows future releases

The timeline hasn't shown any tentative dates for future releases since
2006-03-06 when GCC 3.4.6 was released and the tentative date got
replaced with the real date. Since then only actual release dates have
been added, on the day when the release happens.

diff --git a/htdocs/develop.html b/htdocs/develop.html
index d0ae36bd..f4625817 100644
--- a/htdocs/develop.html
+++ b/htdocs/develop.html
@@ -298,7 +298,7 @@ number carried little to no useful information.
 
 Release Timeline
 
-Here is a history of recent and a tentative timeline of upcoming
+Here is a timeline of historical
 stages of development, branch points, and releases:
 
 
diff --git a/htdocs/releases.html b/htdocs/releases.html
index 56f73ca5..13a086c5 100644
--- a/htdocs/releases.html
+++ b/htdocs/releases.html
@@ -28,8 +28,8 @@ binaries. for various platforms.
 GCC Timeline
 
 The table is sorted by date.  Please refer to our
-development plan for future
-releases and an alternative view of the release history.
+development plan for
+an alternative view of the release history.
 
 
 ReleaseRelease date

---

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 htdocs/develop.html  | 2 +-
 htdocs/releases.html | 4 ++--
 2 files changed, 3 insertions(+), 3 deletions(-)


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- Log -
commit 0dcbe939ef69f9e5088d895bbf6ea93c6685137d
Author: Jonathan Wakely 
Date:   Fri May 23 12:48:56 2025 +0100

Add anchor to new link to GCC 15 notes

diff --git a/htdocs/gcc-14/porting_to.html b/htdocs/gcc-14/porting_to.html
index e8c2869b..004da7a5 100644
--- a/htdocs/gcc-14/porting_to.html
+++ b/htdocs/gcc-14/porting_to.html
@@ -567,8 +567,9 @@ In GCC 14.3 std::vector has been extended so 
that
 the vector(InputIterator, InputIterator) constructor recognizes
 iterators that satisfy the C++20 iterator concepts, such as
 std::random_access_iterator.
-See Porting to GCC 15 for some caveats
-regarding compatibility with C++17-style iterators, and how to fix them.
+See Porting to GCC 15
+for some caveats regarding compatibility with C++17-style iterators,
+and how to fix them.
 
 
 

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commit dd2acc3eb79baf2605c412882a10a87eda846c01
Author: Jonathan Wakely 
Date:   Fri May 23 12:32:53 2025 +0100

Add notes about C++20 iterator concepts and std::vector

diff --git a/htdocs/gcc-14/porting_to.html b/htdocs/gcc-14/porting_to.html
index 2d8eaf3a..e8c2869b 100644
--- a/htdocs/gcc-14/porting_to.html
+++ b/htdocs/gcc-14/porting_to.html
@@ -561,6 +561,16 @@ needs to be performed in a new user-defined macro.
   arithmetic support of these types instead of
   __FLT16_MAX__(or other similar Macros).
 
+C++20 iterator support in 
std::vector
+
+In GCC 14.3 std::vector has been extended so that
+the vector(InputIterator, InputIterator) constructor recognizes
+iterators that satisfy the C++20 iterator concepts, such as
+std::random_access_iterator.
+See Porting to GCC 15 for some caveats
+regarding compatibility with C++17-style iterators, and how to fix them.
+
+
 
 
 
diff --git a/htdocs/gcc-15/porting_to.html b/htdocs/gcc-15/porting_to.html
index db540a9f..74de44f2 100644
--- a/htdocs/gcc-15/porting_to.html
+++ b/htdocs/gcc-15/porting_to.html
@@ -173,6 +173,67 @@ Most uses of  can be adjusted 
to use
 can use  and/or .
 
 
+C++20 iterator support in 
std::vector
+
+In GCC 15.1 (and GCC 14.3) std::vector has been extended so that
+the vector(InputIterator, InputIterator) constructor recognizes
+iterators that satisfy the C++20 iterator concepts, such as
+std::random_access_iterator. This can give significant performance
+improvements for some types of iterator which satisfy the new C++20 concepts
+but which were only considered to be a Cpp17InputIterator under the
+rules of C++17 (and earlier standards). However, it can also cause problems
+for iterator adaptors or iterator facades implemented as templates that wrap
+another iterator class.
+
+
+If an adaptor template declares all the possible operators supported for any
+iterator category (e.g. operator--, operator+,
+operator[], etc.) but does not constrain those operators to only
+be present when the wrapped iterator supports them, then the C++20 standard
+library will incorrectly deduce that the adaptor satisfies the new C++20
+iterator concepts. This means the library might attempt to use
+operator-- on a non-bidirectional iterator,
+or operator[] on a non-random access iterator, resulting in
+compilation errors.
+
+
+Code which encounters these errors should be fixed by constraining the iterator
+adaptors using concepts (or std::enable_if) so that the operator
+functions don't appear to be usable unless they will actually compile.
+For example, the following additions could be used to prevent
+IteratorAdaptor from looking like it supports
+operator--, operator[], and operator-
+when Iter doesn't support those:
+
+template
+class IteratorAdaptor
+{
+  Iter m_iter; // The underlying iterator that is being adapted.
+
+public:
+  // ...
+
+  IteratorAdaptor& operator--()
+#ifdef __cpp_lib_ranges
+  requires std::bidirectional_iterator
+#endif
+  { --m_iter; return *this; }
+
+  reference operator[](difference_type n) const
+#ifdef __cpp_lib_ranges
+  requires std::random_access_iterator
+#endif
+  { return m_iter[n]; }
+
+  friend difference_type operator-(const IteratorAdaptor& lhs, const 
IteratorAdaptor& rhs)
+#ifdef __cpp_lib_ranges
+  requires std::sized_sentinel_for
+#endif
+  { return lhs.m_iter - rhs.m_iter; }
+};
+
+
+
 
 
 

---

Summary of changes:
 htdocs/gcc-14/porting_to.html | 10 +++
 htdocs/gcc-15/porting_to.html | 61 +++
 2 files changed, 71 insertions(+)


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- Log -
commit 9a05fb992d639231f082f0c6455c9d25bb6ff55f
Author: Jonathan Wakely 
Date:   Wed Jul 9 13:51:30 2025 +0100

Add some C++23 and C++26 library features to GCC 16 release notes

Also thank Tomasz for std::format range support in GCC 15

diff --git a/htdocs/gcc-15/changes.html b/htdocs/gcc-15/changes.html
index bf980491..23632d41 100644
--- a/htdocs/gcc-15/changes.html
+++ b/htdocs/gcc-15/changes.html
@@ -679,7 +679,7 @@ asm (".text; %cc0: mov %cc2, %%r0; .previous;"
 
 
   Formatting of ranges and tuples with std::format,
-  as well as string escaping for debug formats.
+  as well as string escaping for debug formats, thanks to Tomasz Kamiński.
 
 
   Clarify handling of encodings in localized formatting of chrono types.
diff --git a/htdocs/gcc-16/changes.html b/htdocs/gcc-16/changes.html
index 99644758..cc6fe204 100644
--- a/htdocs/gcc-16/changes.html
+++ b/htdocs/gcc-16/changes.html
@@ -75,7 +75,26 @@ for general information.
 
 C++
 
-
+Runtime Library (libstdc++)
+
+
+  Improved experimental support for C++26, including:
+
+
+  std::copyable_function and std::function_ref.
+
+std::indirect and std::polymorphic.
+
+  std::owner_equal for shared pointers, thanks to Paul Keir.
+
+
+  
+  Improved experimental support for C++23, including:
+
+std::mdspan, thanks to Luc Grosheintz.
+
+  
+
 
 
 

---

Summary of changes:
 htdocs/gcc-15/changes.html |  2 +-
 htdocs/gcc-16/changes.html | 21 -
 2 files changed, 21 insertions(+), 2 deletions(-)


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- Log -
commit 315f22a7d7a4e600dad9f32b1bae4aae54a14281
Author: Jonathan Wakely 
Date:   Sun Jul 13 17:27:39 2025 +0100

Remove contribute.html text about including ChangeLog in the patch

diff --git a/htdocs/contribute.html b/htdocs/contribute.html
index 3ab65323..4dfb186d 100644
--- a/htdocs/contribute.html
+++ b/htdocs/contribute.html
@@ -254,9 +254,8 @@ the Linux kernel documentation for ways to work around 
this.
 
 (Everything listed here still applies if you can check in the patch
 without further approval under the GCC write access policies, except
-that ChangeLog entries may be included as part of the patch and diffs
-representing new files may be omitted, especially if large, since they
+href="gitwrite.html#policies">GCC write access policies, except that
+diffs representing new files may be omitted, especially if large, since they
 can be accessed directly from the repository.) 
 
 E-mail subject lines

---

Summary of changes:
 htdocs/contribute.html | 5 ++---
 1 file changed, 2 insertions(+), 3 deletions(-)


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